# Developer Scenario Prep — Serverless, SDK & Debug Drills

> Serverless, SDK & Debug Drills (iPhone/iPad app by Shunya Iwasaki.)

- Source: https://appshunter.io/ios/app/developer-scenario-prep/id6794954361 (this page in markdown: same URL + `.md`)
- Developer: [Shunya Iwasaki](https://appshunter.io/developer/1796095304)
- Category: Education, Reference
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 7 MB
- Languages: American English
- Released: 2026-08-06
- Data updated: 2026-08-08
- User reviews in markdown: https://appshunter.io/ios/app/developer-scenario-prep/id6794954361/reviews.md

## What is Developer Scenario Prep?

Most DVA-C02 prep apps test whether you memorized a service name. They don't test whether you can actually reason through a production issue.

This app is built around the judgment calls the real AWS Certified Developer - Associate exam actually asks about: which AWS service fits a requirement, what the retry or idempotency behavior actually is, where a permission boundary should sit, and what the next debugging step is when a Lambda function or deployment misbehaves. Every question includes a full explanation of why the best answer is best AND why every other choice is wrong or weaker -- not just a checkmark.

Why this app is different
- Serverless Event Flow Lab: reason through API Gateway, Lambda, SQS, SNS, EventBridge, Step Functions, and DynamoDB Streams -- synchronous vs. asynchronous, fanout, ordering, and failure paths, shown as clear node diagrams (no AWS console screenshots to memorize).
- Lambda Configuration & Debug Lab: handler, memory, timeout, concurrency, layers, destinations, DLQ, and VPC access -- read real log output and find the actual misconfiguration.
- SDK Behavior Lab: pagination, retryable vs. non-retryable errors, exponential backoff, credential provider chains, idempotency tokens, and waiters -- the AWS SDK behavior every developer exam question assumes you already know.
- DynamoDB Access Pattern Lab: partition/sort keys, Query vs. Scan, GSI/LSI, conditional writes, transactions, TTL, and hot partitions.
- Retry, DLQ & Idempotency Lab, IAM/Cognito/STS Decision Lab, CI/CD Deployment Strategy Lab, SAM & CloudFormation Reading Lab, and Logs/Metrics/Traces Lab round out all 9 Interactive Labs.

Built the way a serious exam should be studied
- 420 original scenario-based questions across all 4 current Exam Guide domains, each mapped to its domain and task and reviewed with a source note and last-reviewed date.
- A Readiness Score built from unseen-question accuracy, not how many times you've clicked through the same question.
- Weak Area Review, Bookmarks, Multiple Response practice, a Custom Session builder, and a Final Cram before test day.
- Standard Timed (65 questions, 130 minutes) and Untimed Study Simulation full mock exams with domain and task breakdowns.

One purchase. No subscription.
- Free: onboarding, exam guide coverage, a 48-question diagnostic set with full explanations, and a starter set of Interactive Labs.
- Lifetime Unlock: every Interactive Lab, the full question bank, both Mock Exam formats, Readiness Score, Weak Area Review, Bookmarks, Custom Session, and Final Cram -- one payment, forever. No ads. No account. No login. No tracking.
- Works fully offline once installed (App Store purchase verification is the only network use).

This independent study app is not affiliated with, endorsed by, or sponsored by Amazon Web Services, Inc. or its affiliates. AWS, Amazon Web Services, and related marks are trademarks of Amazon.com, Inc. or its affiliates. This app does not contain or reproduce actual certification exam questions. Readiness scores are study indicators and do not guarantee examination results.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://common-legume-c99.notion.site/3a9fb55d256781f79c1ef9ad5da0735b

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime Unlock | $29.99 | one-time |



## Version history (last 2 releases)

### 1.1.0 — 2026-08-07

Improved distractor answer quality across the question bank so incorrect choices no longer stand out by length alone -- a content-accuracy pass, no new features.

### 1.0.0 — 2026-08-06

No release notes.

## More apps by Shunya Iwasaki

- [こいぶみ｜カップルの手紙と交換日記](https://appshunter.io/ios/app/id6760828199)
- [Yomiage: Read Articles Aloud](https://appshunter.io/ios/app/yomiage-read-articles-aloud/id6761738905)
- [ラジワイ - ラジオリスナーコミュニティ](https://appshunter.io/ios/app/id6762310665)
- [建設経理ドリル2級｜建設業経理士 一問一答・模試](https://appshunter.io/ios/app/2/id6772605187)
- [Pocadex: KPop Photocard Binder](https://appshunter.io/ios/app/pocadex-kpop-photocard-binder/id6775823303)
- [Onigiri Map: Find & Log Shops](https://appshunter.io/ios/app/onigiri-map-find-and-log-shops/id6779603692)

All apps by Shunya Iwasaki: https://appshunter.io/developer/1796095304

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-08.*